The first stage of development in which a cavity appears is the__________?
Correct answer: D. Balastula
- A. Neurula
- B. Morula
- C. Gastrula
- D. Balastula
Explanation
The blastula is the first embryonic stage in which a fluid-filled cavity called the blastocoel appears. A student may choose morula by confusing the first solid ball of cells with the later hollow blastula.
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